Gear unit for a two-wheeled vehicle

Abstract

A shift system for shifting a gear unit has at least one movably disposed selector shaft and at least one switch element. The selected position of the switch element is changed by movement of the selector shaft relative to the switch element. A drive shaft is rotatable about a center axis. In a first selected position of the switch element, it can be connected to co-rotate at least in one direction of rotation to a component of the gear unit. In a second selected position of the switch element, it can be disconnectable from the component of the gear unit in each direction of rotation. At least a part of the switch element co-rotates with a rotation of the drive shaft about the center axis, so that relative movement of the switch element with respect to the selector shaft is generated. A gear unit has such a switch system.

The invention claimed is: 
     
       1. A shift system for shifting a gear unit, comprising:
 at least one movably arranged selector shaft; and 
 at least one switch element; 
 wherein a selected position of the switch element is variable relative to the switch element by a movement of the selector shaft; and 
 wherein a drive shaft rotatable about a center axis is configured as part of the shift system such that the drive shaft is rotationally fixedly connected to a component of the gear unit in at least one direction of rotation in a first selected position of the switch element, and is disconnectable from the component of the gear unit in any direction of rotation in a second selected position of the switch element; 
 and whereas 
 the switch element is configured in conjunction with the drive shaft such that at least a portion of the switch element co-rotates about the center axis with a rotation of the drive shaft; and 
 the relative movement of the switch element relative to the selector shaft is induced by the part of the switch element rotating with the drive shaft, so that the movement of the switch element between the first and the second selected position is effected by a force branched off from the drive movement of the drive shaft. 
 
     
     
       2. The shift system in accordance with  claim 1 , wherein at least the part of the switch element rotating with the drive shaft has at least one pickup that is movable into contact with the selector shaft, with the pickup being axially and/or radially displaceable with respect to the center axis by the movement of the selector shaft to move the switch element into the second selected position. 
     
     
       3. The shift system in accordance with  claim 2 , wherein the selector shaft has at least one ramp and/or interacts with at least one ramp, with the pickup being axially and/or radially displaceable with respect to the center axis by movement of the pickup circulating about the center axis in contact with the ramp, with a displacement of the ramp being induced by the movement of the selector shaft. 
     
     
       4. The shift system in accordance with  claim 2 , wherein a direction of movement in which the selector shaft moves the ramp in contact with the pickup and a direction of actuation of the pickup of the selector shaft extend perpendicular to one another. 
     
     
       5. The shift system in accordance with  claim 2 , wherein the selector shaft is designed such that the pickup of the switch element is movable between the first selected position and the second selected position by the selection movement of the selector shaft independently of the rotational movement of the drive shaft, in particular by at least one ramp formed axially slantingly at the selector shaft or at a component connected to the selector shaft. 
     
     
       6. The shift system in accordance with  claim 1 , wherein the switch element is designed as a dog clutch, as a shift pawl, or as a shift pawl system. 
     
     
       7. The shift system in accordance with  claim 3 , wherein a switch procedure of the switch element into the second selected position can be carried out by contact of the ramp with the pickup and/or a tension spring is configured that urges the switch element into the first selected position. 
     
     
       8. The shift system in accordance with  claim 1 , wherein the selector shaft has a first section having a smaller diameter and a second section having a larger diameter, whereas the shift system is configured such that a change between the switched positions of the switch element taking place by a change of contact of the switch element and in particular of the pickup via the ramp between the first section and the second section. 
     
     
       9. The shift system in accordance with  claim 2 , wherein a first selector shaft and a second selector shaft are connected to one another axially movably and rotationally rigidly. 
     
     
       10. The shift system in accordance with  claim 9 , wherein:
 a passage shaft is provided that extends along the center axis and on which the first and second selector shafts are received, with the first selector shaft having a first guide link in which a first guide element arranged at the passage shaft is guided and/or the second selector shaft has a second guide link in which a second guide element arranged at the passage shaft is guided so that axial positions of the first and/or second selector shafts are independent of one another along the center axis. 
 
     
     
       11. The shift system in accordance with  claim 1 , wherein a rotational activator is operatively connected to the selector shaft, with the rotational activator being actuable by an operator to initiate a rotational movement in the selector shaft, with the at least one selector shaft being operatively connected rotationally fixedly and axially displaceably to the rotational activator. 
     
     
       12. A gear unit having at least one shift system in accordance with  claim 1 , wherein the gear unit comprises:
 at least one planetary gear; and 
 wherein a component of the at least one planetary gear to which the drive shaft is rotationally fixedly connected in at least one direction of rotation of the gear unit by the switch element is an annulus gear, a planetary carrier, and/or a sun gear of the at least one planetary gear. 
 
     
     
       13. The gear unit in accordance with  claim 12 , wherein two or more planetary gears nested with one another and/or in one another are configured, with the annulus gear, the planetary carrier, and/or the sun gear being shiftable by the first and/or at least one second planetary gear by the shift system. 
     
     
       14. The gear unit in accordance with  claim 12 , wherein two of the at least one planetary gear are interleavedly arranged to each other, wherein the gear unit comprises a freewheel that forms an operative connection between the annulus gear of the second, outwardly disposed planetary gear and a fixedly stationary part of the gear unit. 
     
     
       15. The gear unit in accordance with  claim 12 , wherein two of the at least one planetary gear are interleavedly arranged to each other, wherein the gear unit comprises a freewheel that forms an operative connection between the planetary carrier of the first, inwardly disposed planetary gear and the fixedly stationary part. 
     
     
       16. The gear unit in accordance with  claim 12 , wherein two of the at least one planetary gear are interleavedly arranged to each other, wherein the gear unit comprises a freewheel that forms an operative connection between the sun gear of the first, inwardly disposed planetary gear and the drive shaft.